i had this problem for a while now but its starting to bother me.car runs ok when engine is cold.atleast the first few rpms as i dnt rev hard when engine is cold.after i accelerate when its warm it does not wanna go.kinda like bogs down.i have changed the maf but theres no difference.anyone got any ideas where to start?

if i keep the accelerator real smooth and slow itll give out smooth acceleration but when ever i try to floor it or give it a little more gas it will slow down and no power at all.its a 92 sc400 with 188k miles.

anyone? any help will be greatly appreciated

could be lack of fuel, possibly running lean

it does smell a lot like fuel when i start it..could this be a fuel pump issue?
thanks for reply

I sort of experienced the same thing this weekend. Check out my thread called "Does this car hate me" :lol:

Pretty sure it's the fuel pump or fuel pump ECU. Get a fuel pressure test done and go from there.

It could be the fuel pump ECU going out. Here is a link on how to do it: https://www.clublexus.com/forums/per...tures-faq.html

Mine does this as well but its a different setup entirely. It also runs very rich (based on wideband and fuel odor) and has stalled out one time idling. I've been told it is the IACV. Fuel pressure is stable. Goes away within a few minutes of warming up.

i just checked out your thread..its kinda exactly what my problem is too..did you find a solution yet?i will be taking it to the mechanic tomorow to get the fuel pressure checked out and kinda interested to do the 12v mod.let me know what your solution is.
thanks

i will defenitely try this tomorow after i pay a visit to my mechanic.or do you think i should start with the mod first?

hmm wierd thing is it gets worse when its warmed up.ill keep this in mind too.
thanks

plugs and wires? my car was sputtering and lacking power, but after i changed my wires it felt like a v8 again. i didnt change the plugs because it was iridium.

is there a way to check the wires?

ok so i just did the 12v mod but dont see any change at all.any ideas before i send it for diagnostics tomorow?

hmm theres a special tool for it. but a ghetto method is to put a screw driver in the wires, put it near a ground to see if it sparks? got to have someone crack it though. i did that when i was messing around with hondas though.